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Date: Fri, 17 Jun 2011 21:40:15 -0700 (PDT) From: Hugh Dickins <hughd@...gle.com> To: Chris Wilson <chris@...is-wilson.co.uk> cc: Mario Kleiner <mario.kleiner@...bingen.mpg.de>, Jesse Barnes <jbarnes@...tuousgeek.org>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] drm/i915: Suppress spurious vblank interrupts On Mon, 14 Feb 2011, Hugh Dickins wrote: > On Fri, Feb 11, 2011 at 10:21 AM, Mario Kleiner > <mario.kleiner@...bingen.mpg.de> wrote: > > On Feb 8, 2011, at 8:52 PM, Hugh Dickins wrote: > >> It appears that the > >> underruns, while mysterious and worrisome, have litte or nothing to do > >> with the unflushed text problem which is making 2.6.38-rc unusable. > >> > I'm sorry to say that I have now given up on this: it has already > consumed a lot more time than I can afford to give it. So I've now > just turned CONFIG_DRM_I915_KMS off, which gives me a laptop on which > 2.6.38-rc is usable. > > If in due course there's a likely patch someone would like me to try, > that I can do. And from time to time, with new kernels and with > upgraded userspace, I'll give I915_KMS a try again - indeed, for the > moment I still have it in my 64bit kernel. > > Before switching KMS off, I did establish that, with Chris's overrun > fix, do_intel_finish_page_flip() - the function whose call to > do_gettimeofday() I moved - is no longer called at all. So that > modification was just cargo-cult magic by now (though perhaps made a > difference to timings when overruns were happening), and there's no > reason to suspect Mario's vblank patch at all. Let's assume that if I > attempted a fifth bisection, it would lead me to another (equally > blameless) patch. Nobody else is complaining: maybe my 965 is broken > and just gets along better with 2.6.38 KMS off. Just wanted to report that something (sorry, no time to work out what) in 3.0-rc1 fixed this issue for me, so now I am back on I915_KMS: thanks. Hugh
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